About the power nap timer
Optimize your naps with science-backed timing. 10 minutes for alertness boost, 20 minutes for memory and motor skills (NASA recommended), 90 minutes for complete sleep cycle including REM. Nap before 3 PM to avoid disrupting nighttime sleep.
Recommended times
| Micro-Nap | 10 minutes |
|---|---|
| Power Nap | 20 minutes |
| NASA Nap | 26 minutes |
| Full Cycle | 1 hour 30 minutes |
How to use the power nap timer
- Choose a preset, or tap Edit time to type any hours, minutes and seconds.
- Press Start Timer (or the space bar). The finish time appears under the digits.
- Press Full screen to fill the screen — handy for classrooms, meetings and kitchens.
- When it reaches zero an alarm plays until you press Stop Alarm.
Keyboard shortcuts
- Space start / pause
- R reset
- F full screen
- M mute
Frequently asked questions
How long should a power nap be?
10–20 minutes gives an alertness boost without grogginess. 26 minutes is the length used in NASA's pilot study. If you have time, a 90-minute nap covers a full sleep cycle.
Will the alarm wake me up?
Yes, it repeats until you press Stop Alarm (up to two minutes). Keep the tab open, turn the volume up and don't mute your device.
What presets does the power nap timer have?
Micro-Nap (10 minutes), Power Nap (20 minutes), NASA Nap (26 minutes), Full Cycle (1 hour 30 minutes). Tap Edit time to set any other length.
Is it free, and do I need an app?
It is completely free with no sign-up or download. It works in any modern browser on phones, tablets and computers.